Messages in this thread |  | | Subject | Re: Question: Using floating point in the kernel | Date | Thu, 21 Sep 2000 23:04:56 +0100 (BST) | From | Alan Cox <> |
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> On Wed, 20 Sep 2000, Lyle Coder wrote: > >You cannot use MMX registers in the kernel either, since the kernel doesen't > >save and restore FX state (fxsave, fxrstor) either (just like > >(fsave/frstor). > > You might want to tell the software RAID maintainers that... RAID5 CRC > calculations can be done with MMX. (I'm sure they save and restore the > FPU state, however. Yes, the save/restore cycle is _damned_ expensive.)
The raid5 folks include Ingo who knows precisely what he is doing to get away with it. For 2.4 its a bit cleaner and there is infrastructure for it
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